TagBad (Tag-based PE function)

Test if a point has an abnormal state at a given time. If the point's type is R or I, any digital state is abnormal. If the point is type D, the states that are defined for that point are normal; all others are abnormal.

Syntax

Tagbad(tagname [, time])

Arguments

tagname

A tagname.

time

Optional. A time expression. If omitted, the current time (*) is used.

Returns

0 if the point's state at time is normal, 1 if it is abnormal.

Exceptions

If point does not exist, or has no archived value at time, returns an error value.

Notes

Badval can test any value or expression; TagBad can only test a point.

Example

TagBad('tag1', '*')

TagBad('digitaltag', '14-Dec-97')

TagBad('tag1', 'y')